Need a diagnosis
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Freshman User
Joined: Sep 2004
Posts: 28
Likes: 0
From: Vancouver Island
Need a diagnosis
I've been running my propane converted truck with no thermostat for several months with no problems. We recently had a cold snap that forced me to put one in because propane systems freeze without enough heat. I spent the extra for a fail-safe thermostat (fails in open position). For 3 or 4 days the truck's performance improved but the other day I was driving home from work and it's health quickly deteriorated to the point where I was overheating and I had no power. Now when I start her up she can barely hold idle and there's absolutely no power in gear. My first thought is that somehow the extra heat/pressure has either revealed a pre-existing problem or caused a new one. Any thoughts as to what I should check first? The only thing I've done so far is change the PCV valve but that didn't help.
Thread Starter
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Freshman User
Joined: Sep 2004
Posts: 28
Likes: 0
From: Vancouver Island
There is no carb because it's propane. The mixer has an adjusting screw presumably for the air/fuel mix. I played with that and if I set it to wide-open there is a slight improvement but not nearly enough. At idle it shakes and bucks like mad. When I last drove it, it seemed to do better when I was going downhill. When going uphill or trying to accelerate the engine rumble gets way deeper (low note sound) and it taps like a diesel. When I slow down to stop I have to keep the gas on or it feels like it will stall.
